How jewelers make money in India is by pricing at 24 carat and selling you 18 carat gold. Non gold extras like paint, artificial add-ons are added to gold weight. Buy BIS mark gold for safe deal. Making, polishing, design charges are source of profit. Seller buys back its own gold at lower rate by deducting 10-20%.

GPS in smartphone uses mobile internet data if you don't have maps downloaded on smartphone. Google maps has offline maps feature save mobile data. Global Positioning Service - GPS is provided free of cost by satellite everywhere. Data will be used to get maps on the go with T Mobile, Verizon, At&T, Airtel, Vodafone.

Avoid Sales tax on Jewelry by purchasing from out of state gold shop and then ship. Use tax is due in your state but no tracking is done for small and medium purchases. Can pay in cash to avoid tracking, is any. Buy gold bars, engagement ring, diamonds from New Jersey and ship it your home address outside NJ/NY.